BOOK XXV.
THE NATURAL HISTORY OF THE WILD PLANTS.
CHAP. 1. (1.)—WHEN THE WILD PLANTS WERE FIRST BROUGHT INTO USE.
The more highly esteemed plants of which I am now about to speak, and which are produced by the earth for medicinal purposes solely, inspire me with admiration of the industry and laborious research displayed by the ancients. Indeed there is nothing that they have not tested by experiment or left untried; no discovery of theirs which they have not disclosed, or which they have not been desirous to leave for the benefit of posterity. We, on the contrary, at the present day, make it our object to conceal and suppress the results of our labours, and to defraud our fellow-men of blessings even which have been purchased by others. For true it is, beyond all doubt, that those who have gained any trifling accession of knowledge, keep it to themselves, and envy the enjoyment of it by others; to leave mankind uninstructed being looked upon as the high prerogative of learning. So far is it from being the habit with them to enter upon new fields of discovery, with the view of benefitting mankind at large, that for this long time past it has been the greatest effort of the ingenuity of each, to keep to himself the successful results of the experience of former ages, and so bury them for ever!
And yet, by Hercules! a single invention before now has elevated men to the rank of gods; and how many an individual has had his name immortalized in being bestowed upon some plant which he was the first to discover, thanks to the gratitude which prompted a succeeding age to make some adequate return! If it had been expended solely upon the plants which are grown to please the eye, or which invite us by their nutrimental properties, this laborious research on the part of the ancients would not have been so surprising; but in addition to this, we find them climbing by devious tracts to the very summit of mountains, penetrating to the very heart of wilds and deserts, and searching into every vein and fibre of the earth—and all this, to discover the hidden virtues of every root, the properties of the leaf of every plant, and the various purposes to which they might be applied; converting thereby those vegetable productions, which the very beasts of the field refuse to touch, into so many instruments for our welfare.
CHAP. 2. (2.)—THE LATIN AUTHORS WHO HAVE WRITTEN UPON THESE PLANTS.
This subject has not been treated of by the writers in our own language so extensively as it deserves, eager as they have proved themselves to make enquiry into everything that is either meritorious or profitable. M. Cato, that great master in all useful knowledge, was the first, and, for a long time, the only author who treated of this branch[510] of learning; and briefly as he has touched upon it, he has not omitted to make some mention of the remedial treatment of cattle. After him, another illustrious personage, C. Valgius,[511] a man distinguished for his erudition, commenced a treatise upon the same subject, which he dedicated to the late Emperor Augustus, but left unfinished. At the beginning of his preface, replete as it is with a spirit of piety,[512] he expresses a hope that the majestic sway of that prince may ever prove a most efficient remedy for all the evils to which mankind are exposed.
CHAP. 3.—AT WHAT PERIOD THE ROMANS ACQUIRED SOME KNOWLEDGE OF THIS SUBJECT.
The only[513] person among us, at least so far as I have been able to ascertain, who had treated of this subject before the time of Valgius, was Pompeius Lenæus,[514] the freedman of Pompeius Magnus; and it was in his day, I find, that this branch of knowledge first began to be cultivated among us. Mithridates, the most powerful monarch of that period, and who was finally conquered by Pompeius, is generally thought to have been a more zealous promoter of discoveries for the benefit of mankind, than any of his predecessors—a fact evinced not only by many positive proofs, but by universal report as well. It was he who first thought, the proper precautions being duly taken, of drinking poison every day; it being his object, by becoming habituated to it, to neutralize its dangerous effects. This prince was the first discoverer too of the various kinds of antidotes, one[515] of which, indeed, still retains his name; and it is generally supposed that he was the first to employ the blood of the ducks of Pontus as an ingredient in antidotes, from the circumstance that they derive their nutriment from poisons.[516]
It was to Mithridates that Asclepiades,[517] that celebrated physician, dedicated his works, still extant, and sent them, as a substitute for his own personal attendance, when requested by that monarch to leave Rome and reside at his court. It is a well-known fact, that this prince was the only person that was ever able to converse in so many as two-and-twenty languages, and that, during the whole fifty-six years of his reign, he never required the services of an interpreter when conversing with any individuals of the numerous nations that were subject to his sway.